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CONDENSED MATTER
Weak ferromagnetism in BiFeO$_3$-based multiferroics
I. O. Troyanchuk,
M. V. Bushinsky,
A. N. Chobot,
O. S. Mantytskaya,
N. V. Tereshko Scientific-Practical Materials Research Centre of NAS of Belarus
Abstract:
The magnetic properties of the Bi
1 − x Ln
x FeO
3 (Ln is a rare-earth ion), Bi
1 − x A
x FeO
3 − x/2 (A is an alkali earth ion), and BiFe
1 − x Ti
x O
3 + δ solid solutions in magnetic fields up to 14 T have been studied. The concentration ranges of the existence of the ferroelectric phase described by the space group
R3
c have been determined. It is shown that the substitution of the rare-earth ions for the Bi
3+ ions leads to a sharp decrease in the critical fields inducing the metamagnetic transition from a modulated antiferromagnetic state to a weakly ferromagnetic one; however, the modulated structure in the concentration range of the
R3
c phase is mainly retained. The substitution of the alkali earth ions (
x ~ 0.1) for the bismuth ions leads to the total destruction of the modulated structure and to the implementation of the weakly ferromagnetic state within the
R3
c phase. A homogeneous weakly ferromagnetic state has been revealed when the Ti
4+ ions (
x = 0.1) are substituted for the Fe
3+ ions in the ferroelectric
R3
c phase.
PACS:
75.30.Kz,
75.50.-y,
75.60.Ej Received: 19.12.2008